Low-temperature Synthesis of MoS2 @ CoS2 Heterostructures in KSCN Molten Salt for Efficient Hydrogen Evolution Reaction

Transition metal sulfides(TMSs)have been recognized as potential electrocatalysts for hydrogen evolution reaction(HER),where the edges and defects of TMSs are known as the active sites[1-2].MoS2 with layered crystal structure is so far the most frequently investigated one,however,the associated HER activi-ty is restricted by its low conductivity because of the wide bandgap(1.73 eV)[3-4].Although constructing heterostructures,for example,MoS2@CoS2,presents higher HER activity,the synthetic methods are generally limited by either high-pressure hydrothermal or high-temperature annealing procedures,which lead to unsatisfactory electrochemical performance and low pro-ductivity[5-6].